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Finding the Fourth Proportional to 8,915.78, 12,304.06 and 5,138.64

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Solution

The fourth proportional to 8,915.78, 12,304.06 and 5,138.64 is: 7,091.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,915.78 : 12,304.06 = 5,138.64 : x
  2. Step 2: Convert to fraction form
    8,915.78/12,304.06 = 5,138.64/x
  3. Step 3: Cross multiply
    8,915.78x = 12,304.06 × 5,138.64
  4. Step 4: Simplify right side
    8,915.78x = 63,226,134.88
  5. Step 5: Solve for x
    x = 63,226,134.88/8,915.78
  6. Step 6: Final answer
    x = 7,091.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.